Plaster or composition board.



PATENTED APR. 14, 1908.

G. RADER. PLASTER 0R COMPOSITION BOARD.

APPLIOATION FILED FEB.21, 1908.

GUSTAVE RADER, OF MONTOLAIR, NEW JERSEY.

PLASTER OR COMPOSITION BOARD.

Specification of Letters Batent.

Patented April 14, 1908.

Application filed February 21, 1908. Serial No. 416,996.

To all whom it may concern:

Be it known that I, GUSTAVE RADER, a citizen of the United States,residing at Montclair, in the county of Essex and State of New Jersey,have invented certain new and useful Improvements in Plaster orComposition Boards, of which the following is a specification.

This invention relates to an improved plaster-board for covering walls,ceilings, etc., which plaster-boards are made ready for use so that theycan be directly applied to a wall or ceiling in sucha manner that thewall-paper or other covering can be directly pasted thereto withoutrequiring a finishing coating for the plaster-boards; and for thispurpose the invention consists of a plasterboard which comprises a layerof plaster of paris and a face-layer of paper which is united with thelayer of plaster of paris by means of projections or anchors made on therearside of the paper, as will be fully described hlereinafter andfinally pointed out in the c alm.

In the accompanying drawings, Figure 1 represents a perspective view ofmy improved plaster-board, Fig. 2 is a horizontal section on line 2, 2,Fig. 1, and 'Fig 3 is a perspective rear-view of the paper face-layer orcoverin of the plasterboard.

Similar letters of reference-indicate corresponding parts.

Referring to the drawings, it represents a layer of plaster of pariswhich is mixed with suitable fibers, and b a face-layer of paper. Thelayer a is made in any suitable thickness and size, as required for thepurpose to be used, while the face-layer of paper is roughened at itsrear-surface so as to form projections or anchors b.

The projections or anchors b are made on the rear surface of the aper bymeans of a wire-brush, toothed rol er or other suitable means, in aquick and uniform manner. The layer of plaster of paris and fibers isthen cast over the roughened surface of the paper, so that theprojections or anchors enter into the plastic body'of plaster of arisand unite intimately therewith, where y the reliable connection betweenthe body of the plaster and the paper layer is obtained. The facelayerof paper imparts not only considerable strength to the plaster-board asit protects the same against injury and breakage while in transitor,when handled, but forms also a smooth finish by which the finishingcoat of plaster is dispensed with, so that the wallpaper or othercovering can be applied directly to the face-paper and forms an intimateconnection therewith.

Having thus described my invention, I

- claim as new and desire to secure by Letters Patent:

1. A plaster-board consisting of a layer of plaster of paris, and aface-layer of paper united with the same by projections or an.- chorsformed on the rear-side of the paper.

2. A plaster or composition board consisting of a layer of plasticmaterial or composition and a face-layer of suitable fabric united withthe same by specially made integral projections or anchors formed on therear side of the fabric.

3. A laster or composition board consisting of a ayer of plaster ofparis and fiber, and a face-layer of suitable fabric united with thesame by specially made integral projections or anchors formed on therear side of the fabric.

4. A plaster-board composed of a layer of plastic material, and aface-layer of paper united by rojections or anchors at its rearside withthe layer of plastic material.

5. A plastic-board consisting of a rearlayer of plaster of paris, and aface-layer of paper united with the same by projections or anchorsformed on the rear-surface of the paper.

6. A plaster-board consisting of a layer of plaster of paris and fibermixed, anda facelayer of paper united at its rear-side by means ofprojections or anchors with the layer of plaster of paris.

In testimony, that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

GUSTAVE RADER. Witnesses:

PAUL GoEPnL. HENRY J. SUHRBIER.

